function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid Email Address")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid Email Address")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid Email Address")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid Email Address")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid Email Address")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid Email Address")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid Email Address")
		    return false
		 }

 		 return true					
	}

function ValidateForm(){

	var fname=document.form.name
	var lname=document.form.familyname
	var emailID=document.form.emailaddress
	var mobile=document.form.mobileno
	
	var guest=document.form.guestno
	
	if ((fname.value==null)||(fname.value=="")){
		alert("Please Enter Your Name")
		fname.focus()
		return false
	}
	
	if ((lname.value==null)||(lname.value=="")){
		alert("Please Enter Your Family Name")
		lname.focus()
		return false
	}

	

//--------------------------email address validation-----------------------------
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter Email Address")
		emailID.focus()
		return false
	}
	
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
//--------------------------email address validation-----------------------------


	if ((mobile.value==null)||(mobile.value=="")){
		alert("Please Enter Your Contact Number")
		mobile.focus()
		return false
	}

	if ((guest.value==null)||(guest.value=="")){
		alert("Please Enter No. of Guest")
		guest.focus()
		return false
	}
	
	
	

	
	
	
	return true
 }